Millions of people travel about the country by rail， by bus，orby automobile，ordrive to and from their places of work and their homes。
三并列的by， by， by为travel的方语。
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Does it have anything in there about Time Clauses?
面有关于时间状语从的内容吗？
Words like before, after, when, because, since, if and even though can signal an adverb clause.
before，after，when，because，since，if 还有 even though这样的词是状语从的标志。
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划词翻译
详细解释
并列的by， by， by
为travel的方
语。
每日语法
面有关于时间
before，after，when，because，since，if 还有 even though这样
